Pixsoft Sol Login Endpoint servlet sql injection

A vulnerability was found in Pixsoft Sol up to 7.6.6c and classified as critical. This issue affects some unknown processing of the file /pix_projetos/servlet?act=login&submit=1&evento=0&pixrnd=0125021816444195731041 of the component Login Endpoint. The manipulation of the argument txtUsuario leads to sql injection. The attack may be initiated remotely. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.